Did you make a traditional IRA contribution (TIRA) or a Roth IRA contribution?
TIRA contributions are eligible for a deduction (shown on line 32 of 1040), but Roth IRA contributions are not deductible. In addition, there are other constraints that may effect whether you can deduct a TIRA contribution. See below links.
If you made a TIRA contribution, navigate back to the IRA section and verify your entries so that line 32 reflects the deduction.
If you made a Roth IRA contribution but wish it to be a TIRA in order to receive the deduction and are otherwise eligible for the deduction, contact your custodian and re-characterize the Roth contribution before the due date of your return.